<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /* .heart {
            width: 100px;
            height: 100px;
            margin: 100px;
            position: relative;
            background: #f00;
            transform: rotate(45deg);
            -webkit-transform: rotate(45deg);
            -moz-transform: rotate(45deg);
            -o-transform: rotate(45deg);
            -ms-transform: rotate(45deg);
        }

        .heart:before,
        .heart:after {
            content: '';
            position: absolute;
            width: inherit;
            height: inherit;
            background: #f00;
            border-radius: 50%;
            -webkit-border-radius: 50%;
            -moz-border-radius: 50%;
            -o-border-radius: 50%;
            -ms-border-radius: 50%;
        }

        .heart:before {
            left: -50px;
        }

        .heart:after {
            top: -50px;
        } */
    </style>
</head>

<body>
    <!-- <div class="heart"></div> -->
    <script>
        window.requestAnimationFrame = (function () {
            return window.requestAnimationFrame ||
                window.webkitRequestAnimationFrame ||
                window.mozRequestAnimationFrame ||
                window.oRequestAnimationFrame ||
                window.msRequestAnimationFrame ||
                function (callback) {
                    setTimeout(callback, 1000 / 60);
                }
        })();
        (function (window, document, undefined) {
            var hearts = [];
            window.requestAnimationFrame = (function () {
                return window.requestAnimationFrame ||
                    window.webkitRequestAnimationFrame ||
                    window.mozRequestAnimationFrame ||
                    window.oRequestAnimationFrame ||
                    window.msRequestAnimationFrame ||
                    function (callback) {
                        setTimeout(callback, 1000 / 60);
                    }
            })();
            init();
            function init() {
                css(".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: absolute;}.heart:after{top: -5px;}.heart:before{left: -5px;}");
                attachEvent();
                gameloop();
            }
            function gameloop() {
                for (var i = 0; i <hearts.length; i++){
                    if (hearts[i].alpha <=0) {
                        document.body.removeChild(hearts[i].el);
                        hearts.splice(i, 1);
                        continue;
                    }
                    hearts[i].y--;
                    hearts[i].scale += 0.004;
                    hearts[i].alpha -= 0.013;
                    hearts[i].el.style.cssText = "left:" + hearts[i].x + "px;top:" + hearts[i].y + "px;opacity:" + hearts[i].alpha + ";transform:scale(" + hearts[i].scale + "," + hearts[i].scale + ") rotate(45deg);background:" + hearts[i].color;
                }
                requestAnimationFrame(gameloop);
            }
            function attachEvent() {
                var old = typeof window.onclick === "function" && window.onclick;
                window.onclick = function (event) {
                    old && old();
                    createHeart(event);
                }
            }
            function createHeart(event) {
                var d = document.createElement("div");
                d.className = "heart";
                // console.log(event.clientX,event.clientY)
                hearts.push({
                    el: d,
                    x: event.clientX-100 ,
                    y: event.clientY-100 ,
                    scale: 1,
                    alpha: 1,
                    color: randomColor()
                });
                document.body.appendChild(d);
            }
            function css(css) {
                var style = document.createElement("style");
                style.type = "text/css";
                try {
                    style.appendChild(document.createTextNode(css));
                } catch (ex) {
                    style.styleSheet.cssText = css;
                }
                document.getElementsByTagName('head')[0].appendChild(style);
            }
            function randomColor() {
                return "rgb(" + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + ")";
            }
        })(window, document);
    </script>
</body>

</html>